Traveling wave tube

Claim 2

A support device for a periodic permanent magnet travelingwave tube comprising: an annular pole piece Hub of low magnetic reluctance with a base at the inner diameter, and a pair of axially spaced shoulders extending radially from said base forming a channel therebetween, the axial length of said base being greater than the axial length between the distal ends of said shoulders at the outer diameter thereof; and segmented pole pieces of a low magnetic reluctance arcuately formed to be inserted in said channel to form a ring.

Claim 3

In a periodic permanent magnet traveling-wave tube having a cylindrical envelope containing a beam fired down its axial length, a collimator comprising: a plurality of annular pole piece hubs of low magnetic reluctance spaced in an axial direction along the envelope; a plurality of unitary permanent ring magnets bridging the space between said plurality of hubs; and a plurality of segmented pole pieces abutting said plurality of hubs and said plurality of permanent ring magnets.

Claim 4

In a periodic permanent magnet traveling-wave tube having a cylindrical envelope containing a beam fired down its axial length, a collimator comprising: a plurality of annular pole piece hubs of low magnetic reluctance spaced in an axial direction along the envelope; a plurality of unitary permanent ring magnets bridging the space between said plurality of hubs; and a plurality of segmented pole pieces abutting said plurality of hubs and said plurality of permanent ring magnets.

Claim 5

A collimator according to claim 4 wherein each of said annular pole piece hubs further comprises: a material of low magnetic reluctance with a base at the inner diameter, and a pair of axially spaced shoulders extending radially from said base forming a channel therebetween, the axial length of said base being greater than the axial length between the distal ends of said shoulders at the outer diameter thereof.

Claim 6

A collimator according to claim 3 wherein said segmented pole piece further comprises: an inner diameter and sidewalls formed to be inserted in said channel of said annular pole piece, and an outer diameter larger than the outer diameter of said permanent ring magnet for heat dissipation.

Claim 7

A collimator according to claim 4 wherein said plurality of permanent ring magnets are magnetized in the axial direction.

Claim 8

A periodic permanent magnet traveling-wave tube comprising: an evacuated envelope; a conducting helix extending axially through said evacuated envelope; input means for providing an RF input signal to one end of said conducting helix; output means located in an orthogonal direction to said input means for receiving an output signal from said conducting helix; beam-producing means at one end of said helix for providing an interacting beam for amplifying said RF signal; collector means at the opposite end of said helix from said beam-producing means adapted to receive said beam; cooling means bonded to said envelope forming a bump at the end opposite to said beam-producing means; a periodic permanent magnet system including a plurality of annular pole piece hubs spaced in axial direction along at least the axial portion of said envelope that includes said helix with a channel formed on the outer radial portion of each of said hubs and shoulders extending axially from both sides of said channel and a base forming the inner diameter of each of said hubs that is longer in the axial direction than the outer diameter portion of each of said hubs, a plurality of segmented pole pieces arcuately formed to be inserted in said channel to form a ring, said ring having an outer diameter larger than the diameter of a plurality of permanent ring magnets for heat dissipation, and said plurality of permanent ring magnets have an inner diameter large enough to slide over said cabling means and magnetization in the axial direction with the inner diameter portions abutting said hub shoulders and the surfaces extending in the radial direction abutting the radial surfaces of said plurality of segmented pole pieces.

Claim 9

A periodic permanent magnet traveling-wave tube comprising: an evacuated envelope; a conducting helix extending axially through said evacuated envelope; input means for providing an RF input signal to one end of said conducting helix; output means located in an orthogonal direction to said input means for receiving an output signal from said conducting helix; beam-producing means at one end of said helix for providing an interacting beam for amplifying said RF signal; collector means at the opposite end of said helix from said beam-producing means adapted to receive said beam; cooling means bonded to said envelope forming a bump at the end opposite to said beam-producing means; a periodic permanent magnet system including a plurality of annular pole piece hubs spaced in axial direction along at least the axial portion of said envelope that includes said helix with a channel formed on the outer radial portion of each of said hubs and shoulders extending axially from both sides of said channel and a base forming the inner diameter of each of said hubs that is longer in the axial direction than the outer diameter portion of each of said hubs, a plurality of segmented pole pieces arcuately formed to be inserted in said channel to form a ring, said ring having an outer diameter larger than the diameter of a plurality of permanent ring magnets for heat dissipation, and said plurality of permanent ring magnets have an inner diameter large enough to slide over said cabling means and magnetization in the axial direction with the inner diameter portions abutting said hub shoulders and the surfaces extending in the radial direction abutting the radial surfaces of said plurality of segmented pole pieces.